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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d947c2d531fbd20bff62017954cee11e303ded4766a07896a5aed53770dfda' 
  AND token = 'SX8pTuEEizXYjZUVgEA4rfrZHdCnlT/fOj0BF3N+pdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}